NDLI: Microscopy of some interactions between Botryosphaeriaceae species and grapevine tissues

Content Provider	Springer Nature Link
Author	Amponsah, N. T. Jones, E. E. Ridgway, H. J. Jaspers, M. V.
Copyright Year	2012
Abstract	This study investigated the endophytic interactions between Botryosphaeriaceae pathogens and their woody hosts and the role of wounds in development of infection of green tissues. At 2 and 3 months after inoculating trunks of 2 year old grapevine plants with Neofusiciccum australe, N. luteum, N. parvum or Diplodia mutila, sap samples provided no evidence of pathogen propagules, indicating that the dieback symptoms observed at a distance from the lesions on inoculated sections of the trunks were not due to internally transmitted propagules. However, longitudinal sections cut from beyond trunk lesions showed hyphae of the four fungi grew within xylem vessels, which was consistent with endophytic fungal development observed in previous experiments. When conidia of N. luteum were inoculated onto green shoots and leaves of potted grapevines, which were wounded or non-wounded, and excised or attached to living plants, scanning electron microscope studies showed that conidial development was significantly affected by the condition of tissues. On detached and wounded leaf and shoot surfaces, most conidia had germinated by 3 h after inoculation and by 24 h had developed into networks of mycelium. On attached and wounded leaf and shoot surfaces it took 24 h for most conidia to germinate. However, when green tissues were attached and non-wounded, conidia did not adhere or germinate, all conidia being shed from the tissues within 24 h. These studies have provided explanations for phenomena observed during infection studies and have demonstrated that the pathogen-host interactions are complex, warranting further examination of the physiology of the interactions.
Starting Page	665
Ending Page	673
Page Count	9
File Format	PDF
ISSN	08153191
Journal	Australasian Plant Pathology
Volume Number	41
Issue Number	6
e-ISSN	14486032
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-05
Publisher Institution	Australasian Plant Pathology Society
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Conidial germination Endophytic Wounding Excised tissues Agriculture Plant Sciences Ecology Plant Pathology Entomology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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